Baron Simon Bernard (28 April 1779 – 5 November 1839) was a French general of engineers. Born in Dole, Simon Bernard was educated at the École polytechnique, graduating as second in the promotion of 1799 and entered the army in the corps of engineers.
He rose rapidly, becoming a captain in 1800 and a major in 1809. After being involved in the works to the Port of Antwerp, Bernard served (1809–1812) as aide-de-camp to Napoléon. Promoted to colonel in 1813, he was wounded in the retreat after the battle of Leipzig and distinguished himself the same year (1813) in the gallant three month defense of the besieged city of Torgau against the allies.
After Napoléon's first abdication he rallied to the Bourbons and was promoted to general de brigade by Louis XVIII of France and made a knight of Saint Louis. Bernard was tasked by the minister of war Clarke with topographical work. After Napoléon's return from Elba, Bernard rallied to the emperor and took part in the battle of Waterloo in 1815.
After the emperor's second abdication he was banished from France and, refusing an offer for employment from czar Alexander I of Russia, he emigrated to the United States, where, being made an assistant engineer with the rank and pay of a brigadier-general of engineers on November 16, 1816. He designed a number of extensive forts for the Army, notably Fort Monroe and Fort Wool in Virginia, Fort Adams in Newport, RI, Fort Morgan in Alabama, and around New York, and did a large amount of the civil engineering connected with the Chesapeake and Ohio Canal and the Delaware Breakwater.